french fries vs white potato

french fries and white potato both are nouns.

Word	Noun	Adjective	Verb	Adverb
french fries	Yes	No	No	No
white potato	Yes	No	No	No

As nouns, white potato is a hypernym of french fries; that is, white potato is a word with a broader meaning than french fries:

french fries: strips of potato fried in deep fat
white potato: an edible tuber native to South America; a staple food of Ireland

Other hypernyms of french fries include Irish potato, murphy, potato, spud, tater.

french fries (noun)	white potato (noun)
strips of potato fried in deep fat	an edible tuber native to South America; a staple food of Ireland
	annual native to South America having underground stolons bearing edible starchy tubers; widely cultivated as a garden vegetable; vines are poisonous